Telephone system.



B. G. JAMESON.

TELEPHONE SYSTEM.

`\1"PL1c.1-1'1 1N111.111 .\U11.15,1o11.

L? l O8. Patented May 12, 1914-.

d I il.,

IBERTRAND Gf. JAMIEsoN, or cnicaoo, iLLiNois.

TELELHONE SYSTEM.

v Specification of Letters Patent.

Taten t cit al uy 1 25, ill

Application fried August 1a. 191i. sensing. einem.

To albo/tom it may concer/z lie it known that I. lnu'iuixn (el. ,la unison, a citizen of'the United States. residing` at Chicago, in the county of CooltY and State or` Illinoisrhave invented a certain new and useful .linprm'en-ent in '.llelephone Systems, ot which the following is afull, clear, concis-e, and exact description, reference being had to the acciifmpanying drawings. forming' a part of this specitication. My invention relates to telephone systems and has .for its object the provisionof means whereby certain signaling indications may be established at the` central exchange 'at the lwill of the subscriber.

My invention is of particular utility tor private branch exchange switchboards` although notso limited.

ln this description and drawing. I show and describe my invention as applied to a common battery telephone systcnnalthough -it will be uiiderstood it is not to be so limited. It is customary in-cfamnon battery systems, for instance, for a signal to be voperati-2d at the exchange in response to the actuation oitl the switchboard lever atthe l substation;

My invention concerns itseli with the provision of means whereby thel operator may receive va further signaling indication which noties thecperator that the subscriber is temporarily away from his instrument andv which ksignaling indication may .be discon-fA tinued- Iwhen the subscriber returns Southall he is again accessible through *then xifs'trument.. l l 1n the forni herein shown my invention v concerns itseltl with providing the operator with an audible signal 'which she receivesl .upon making the test and which audible signal informs herthat the line she desires while not busy, is not available for calling purposes as the subscriber for that line is .away from the instrument. l

l will explain my invention more'in detail by reference 'to the accompanying drawing illustrating' -one embodiment thereof4 dialarannnatically. l

In the drawing I have illustrated a central exchange A and two substations B and (l served by this exchange. The substation B has the customary receiver 1, switchhook lever Q, induction coil 37 condenser 4, transmitter signal receiving devicet and conl. Y, vdenser 7 all associated with the line wires 8 and 9. The equipmeirtissimilarfat the substation C. lille lines li and t) the central cxchanuoarc associated with vthe line relay lt). cut ott' relay 1l, common battery l2. answering' jack l-l. answeringlainpv1t and multiple jacks-15. .the thiinbles 16y of the jacksv are connected together'bymeans ot' the conductor 17 as is welt-.understood and this conductor is associated lwith a cutoii' relay 11, the other terminal of said cut oli' relay being grounded. This line circuitarrangement and also the cord circuit arrangement is 01 well known construction and is not part of my invention. The cord circuit has the customary plugs 18 and 19, the talking strands 20 and 2l, and the supervisory and telephone circuit controlling strand 22,' The cord circuit is likewise provided with the ordinary repeating' coils 23, 23, supervisory lamps 2li, 24e, listening keys 25 and an operators set 2G.

Whenever the switchhoolzis moved to close the line circuit. at the substation, the answering lamp 1+i actuated by the line relay l() to be extinguished thereafter by the cut ott' relay 1l. At the substation further provide a switch consist-ing oia spring 07, a contact 28, resistance 2S) and button 30 vwhich' l utilize for sendinga selective signal armatures 3:31 and 232 are attracted to light,

the lamp 14; and also to perform another Afunc-tion that will presently appear. Should however a less amount of current. be sup plied to therelay 10 as when the button l0 is actuated to close the circuit across the conductors 8 and 9 through the resistance 27, then this currentis not. sutlicieiit to actuate the'armatures 332 and 33, but sufficient to actuate the armature 31, which armature 31 therefore is in closed circuit withits contact. 35, and by means of the conductor 36 passingthrough` .the condenser 37, connects the conductor Y17Qthroiugh said armature 31, l

contact 85. conductor 38,' contact 39, conductor 40, with the secondary winding; 41 of a vibrator 42. The other terminal of the conductor 41 is then grounded.

` It will thus be seen that while the button' 30 is depressed thesthimbles 1G are connected. to ground through the secondarywinding 4:1.

`line when she desires to malle a` call.

This secondary winding yll is in iniluctii'e relation with a primary winding; lil, which primary winding is continually imlfiressinEn innses incluctively on the secondary Winding ill, as lhesaiil primary winding associati-inl tlnough battery 3l with u ribrm tory Contact 45. New should thc operator in. making' a test, es when the siretl, connect thc tin e plug with n thimlile iii, then a circuit cstnblislietl from ground ell' through the secoinilary 'Winding' l-l, conductor Q20. intermediate contacts 3f) and condenser 31", concluetor l?, thimbles l tip 46, cmitluctor 48, rcpeatng coil Q3 to ground at The operator thus hears the buzzing emitted by the vibrator 42 nncl knows that the line ilesirefl is not available as the subscriber away from the instrument tenxpororily. T imc is thus sareiiin calling this statiini or attempt ing to call this station to ascertain if the party desired is there. lion* nl? n the plug l@ iis inserted in the jat-lt howe'icr in orrler to make an emergency call for-station B, then the armatures of relay 21,0 are restored nevertheless` by Virtue oi, the energizing et' the relayY ll so that the vibra tor l is tlisconnectetl i thimble When the sub scriber re ens he releases the button 3G and his line is again available for use. The switchhooli' Q is pro'vidci'l with a depending; arm 50 so that when tl i said switchhook is to place the line in service, this depending erm 50 releases the button 8G and thereby opens the bridge including the resistance 29. It will thus be seen that not only the answering but the multiple jacks are proviclecl with means whereby the subscriber may establish distinctive conditions so that the operator will be apprisecl of the avaiiabilizy et the A great deal of time can thus be saved. The push button 30 may also be under direct con, trol of some other instrumental-ity that activ etes manually, and this is illustrated at substati on C Where the push button 30 :is under the control of the sliding top 51 of a roll ltop flesh, the table top oi' which is inclicatecl As before stated am showing the inveir tion speciiicallyhere in cornice-tion with a common battery system and also describe speiiically merely one embodiment of the many which my invention may talco. lf (lo not limit myself therefore to this specific description, but having thus clescribccl one .embodiment of my invention,

lVlist claim as new and desire to secure by Letters Patent is:

l. A telephone system having a central exchange. a plurality'of snbstations, and circuits uniting saifl snbstations with saifl central eznfhange, connecting terminals for each line circuit 'fit the exchange, a common switchboard for saiti circuits and connecting' substation l ile of her answering .Lessons terminals, means under the control onthc substation 'for establishing at the said switchboard the busy and not busy condition ci its associated line, and means controlled at the substation for establishing at the said switchboard a further anti at will permanent (lis motive thimble test conilition of its associated line.

A. telephone system having a central erx'hanie, a plurality of substations, ancl circuits uniting,r said substations with said central exchange, a common switchboard for saitl circuits. means under the control of the substation for establishing' at the said su'i tchboarcl the busy and not busy conlition oil its associated line, and means conn lrolletl at the substation for establishing at the said, switchboard a further and at Will permanent distinctive thimble 'test condition olE ils associated line whereby to convey to the same operator distinctive signaling in- (licaiions.

3. i telephone system having a central exchange, a plurality of substations, and cir cuits uniting said subststions with hsaid cen tral exchange, connectii'lg terminals inclndinn' test. lhimbles :lor each line circuit at the exchangeH means under the control of the subi-:tation for establishing at the exchange the busy "l and not busy condition of its associated line, and means controlled at the substation for establishing' at the exchange in connection with said` test thimbles aV further iiistinctive condition of its associated line. i i

4. A telephone system having a central exchangeR ay plurality ol. snbstations, and circuits unitingr said substations with saicl central exchange, connecting' terminals including multiple test thimbles for each line circuit. at the exchange, means under the con-- trol of the substation. for establishing at the exchange the busy and notvbusy condition of its associated line, and means controiled at the substation for establishing at the exchang', in connection with said multiple test thiinbles a further distinctive condition of its associated line.

5. A telephone system having` a central change, a plurality of snbstatio1is,'and cir cuits unitingr said substations with Isaid Corb tral exchange, a common switchboard for s'aicl circuits and connecting terminals, means under the control of the substation forestalilishing'at kthe sairl s .'itchboarfl the biisy7 and not busy condition of its associated, line` means controlled at the substation for `establishingt at :the said switchboard, a Jfurther and at- Will permanent distinctive ,thimble test condition ci! its associated line, anrl means whereby the lasty aforesaid means is controlled by the first aforesaid means.

(3. A telephone system having a central exchange. a plurality of substations, and circuits uniting said substalions with saicl cenmossos tml exchange, s common switcliboaid foi said cii'onits snol ccnnecing terminals, means under the control of the substation for establishing at the exchange the bnsjy7 and noty busy condition of its associated' line, and means controlled' at the substation for establishing ai; the said switchboard a further and at will permanen clistincive ninible test condition of its `associated. line, said last aforesaid means including a switch and un impedance device.

7. telephone system having a' central exchange, a plurality of snbststions, and circuits uniting said substafions with said cenoral exchange, a common switchboard foi' said circuits and connecting terminals, means under the control of the substation for establishing ab the exchange the busy? and not busy condition of ibs associated line, and means controlied at the subseion for establishing at the said switchboaid a. 'further and :it will permanent distinctive iiimble best condition of its associated line, said last aforesaid ine-ans including a, switch and an inipedsnce clevioe, said impedance ievice having sufficient impedance not to injui'iously a'eot the. talking oondition of the line.

In Witness Whereof,' i hereunto subscribe my naine this 3rd day of August A. D., 191i. o

BERTRAND G. JAMESON. litnesses lAzEL JoNns, MAX W. ZABEL. 

